Photographic element having a transparent magnetic recording layer

Abstract

A photographic element comprising a support having provided thereon a light-sensitive layer and a transparent magnetic recording layer, the magnetic recording layer comprising a transparent polymeric binder, ferro-magnetic particles and tin oxide particles, the magnetic particles having a surface area greater than 30 m 2 /gm and a coverage of from about 1×10 -11 mg/μm 3 to about 1×10 -10 mg/μm 3 , the tin oxide particles having a median diameter of less than 0.15 μm and being present in the transparent magnetic layer in an amount of from 300 to 1200 percent by weight based on the weight of the binder.

What is claimed is: 
     
       1. A photographic element comprising a support having provided thereon a light-sensitive layer and a transparent magnetic recording layer, the magnetic recording layer comprising a transparent polymeric binder, ferro-magnetic particles and tin oxide particles, the magnetic particles having a surface area greater than 30 m 2  /gm and a coverage of from about 1×10 11  mg/μm 3  to about 1×10 mg/μm 3 , the tin oxide particles having a median diameter of less than 0.15 μm and being present in the transparent magnetic layer in an amount of from 300 to 1200 percent by weight based on the weight of the binder. 
     
     
       2. The photographic element of claim 1 wherein the tin oxide particles have a median diameter less than 0.1 μm. 
     
     
       3. The photographic element of claim 1 wherein the tin oxide particles have a median diameter of from 0.05 to 0.1 μm. 
     
     
       4. The photographic element of claim 1 wherein the tin oxide particles are electrically conductive. 
     
     
       5. The photographic element of claim 4 wherein the tin oxide particles are present in the amount of from 1000 to 1200 percent by weight based on the weight of the binder. 
     
     
       6. The photographic element of claim 4 wherein the tin oxide particles are antimony doped tin oxide. 
     
     
       7. The photographic element of claim 4 wherein the tin oxide particles are indium doped tin oxide. 
     
     
       8. The photographic element of claim 1 wherein the polymeric binder is a cellulose ester, a polyurethane or a vinyl polymer. 
     
     
       9. The photographic element of claim 8 wherein the polymeric binder is crossed-linked. 
     
     
       10. The photographic element of claim 9 wherein the polymeric binder is cross-linked by a melamine, and aziridine or an isocyanate. 
     
     
       11. The photographic element of claim 9 wherein the polymeric binder is cross-linked with an isocyanate. 
     
     
       12. The photographic element of claim 11 herein the polymeric binder contains active hydrogen atoms as determined by the Zerewitinoff test. 
     
     
       13. The photographic element of claim 8 wherein the polymeric binder is a cellulose ester. 
     
     
       14. The photographic element of claim 13 wherein the cellulose ester is a cellulose acetate. 
     
     
       15. The photographic element of claim 14 wherein the cellulose acetate is cellulose diacetate. 
     
     
       16. The photographic element of claim 15 wherein the cellulose diacetate is cross-linked with a polyisocyanate. 
     
     
       17. The photographic element of claim 14 wherein the cellulose acetate is cellulose triacetate. 
     
     
       18. The photographic element of claim 8 wherein the polymeric binder is a polyurethane. 
     
     
       19. The photographic element of claim 8 wherein the polymeric binder is a vinyl polymer. 
     
     
       20. The photographic element of claim 1 wherein the tin oxide particles are nonconductive. 
     
     
       21. The photographic element of claim 1 wherein abrasive particles having a median diameter of 0.2 to 0.4 μm are included in the transparent magnetic recording layer. 
     
     
       22. The photographic element of claim 21 wherein the abrasive particles are present in an amount of from 1 to 20 weight percent based on the weight of the binder. 
     
     
       23. The photographic element of claim 21 wherein the abrasive particles are present in an amount of from 1 to 7 weight percent based on the weight of the binder. 
     
     
       24. A transparent magnetic recording layer comprising a transparent polymeric binder, ferromagnetic particles and tin oxide particles, the magnetic particles having a surface area greater than 30 m 2  /gm and a coverage of from about 1×10 -11  mg/μm 3  to about 1×10 -10  mg/μm 3 , the tin oxide particles having a median diameter of less than 0.15 μm, and being present in an amount of from 300 to 1200 percent by weight based on the weight of the binder. 
     
     
       25. The transparent magnetic recording layer of claim 24 wherein the tin oxide particles have a median diameter less than 0.1 μm. 
     
     
       26. The transparent magnetic recording layer of claim 24 wherein the tin oxide particles have a median diameter of from 0.05 to 0.1 μm. 
     
     
       27. The transparent magnetic recording layer of claim 24 wherein the tin oxide particles are electrically conductive. 
     
     
       28. The transparent magnetic recording layer of claim 27 wherein the tin oxide particles are present in the amount of from 1000 to 1200 percent by weight based on the weight of the binder. 
     
     
       29. The transparent magnetic recording layer of claim 27 wherein the tin oxide particles are antimony doped tin oxide. 
     
     
       30. The transparent magnetic recording layer of claim 27 wherein the tin oxide particles are indium doped tin oxide. 
     
     
       31. The transparent magnetic recording layer of claim 24 wherein the polymeric binder is a cellulose ester, a polyurethane or a vinyl polymer. 
     
     
       32. The transparent magnetic recording layer of claim 31 wherein the polymeric binder is crossed-linked. 
     
     
       33. The transparent magnetic recording layer of claim 32 wherein the polymeric is cross-linked by a melamine, and aziridine or an isocyanate. 
     
     
       34. The transparent magnetic recording layer of claim 32 wherein the polymeric binder is cross-linked with an isocyanate. 
     
     
       35. The transparent magnetic recording layer of claim 31 wherein the polymeric binder is a cellulose ester. 
     
     
       36. The transparent magnetic recording layer of claim 35 wherein the cellulose ester is a cellulose acetate. 
     
     
       37. The transparent magnetic recording layer of claim 36 wherein the cellulose acetate is cellulose diacetate. 
     
     
       38. The transparent magnetic recording layer of claim 37 wherein the cellulose diacetate is cross-linked with a polyisocyanate. 
     
     
       39. The transparent magnetic recording layer of claim 36 wherein the cellulose acetate is cellulose triacetate. 
     
     
       40. The transparent magnetic recording layer of claim 32 wherein the polymeric binder is a polyurethane. 
     
     
       41. The transparent magnetic recording layer of claim 31 wherein the polymeric binder is a vinyl polymer. 
     
     
       42. The transparent magnetic recording layer of claim 24 wherein the polymeric binder contains active hydrogen atoms as determined by the Zerewitinoff test. 
     
     
       43. The transparent magnetic recording layer of claim 24 wherein abrasive particles having a median diameter of 0.2 to 0.4 μm are included. 
     
     
       44. The transparent magnetic recording layer of claim 43 wherein the abrasive particles are present in an amount of 1 to 20 weight percent based on the weight of the binder. 
     
     
       45. The transparent magnetic recording layer of claim 44 wherein the abrasive particles are present in the amount of 1 to 7 percent.